AD8362
CHARACTERIZATION SETUP
EQUIPMENT
The general hardware configuration used for most of the AD8362
characterization is shown in Figure 40. The signal source is a
Rohde & Schwarz SMIQ03B. A 1:4 balun transformer is used to
transform the single-ended RF signal to differential form. For
frequencies above 3.0 GHz, an Agilent 8521A signal source
was used. For the response measurements in Figure 32 and
is used. For Figure 36, the configuration shown in Figure 43 is
used.
CHARACTERIZATION
BOARD
3dB RFIN
VOUT
TEK TDS5104
SCOPE
TEK P5050
VOLTAGE PROBE
C1
AD8362
COMM
CHPF
DECL
ACOM
VREF
VTGT
VPOS
VOUT
VSET
ACOM
CLPF
02923-041
SMT03
SIGNAL
GENERATOR
RF 50Ω
INHI
3dB
BALUN
C2
C3
INLO
DECL
PWDN
COMM
HPE3631A
POWER
SUPPLY
C4
AD8362
Figure 41. Response Measurement Setup for Modulated Pulse
MULTIMETER
HP34401A
TEK TDS5104
SCOPE
TEK P5050
VOLTAGE PROBE
C1
02923-040
SMIQ03B
RF SOURCE
AD8362
COMM
CHPF
DECL
ACOM
VREF
VTGT
VPOS
VOUT
VSET
ACOM
CLPF
C4
HPE3631A
POWER
SUPPLY
PC
CONTROLLER
Figure 40. Primary Characterization Setup
SMT03
SIGNAL
GENERATOR
RF 50Ω
HP8112A
PULSE
GENERATOR
INHI
3dB
BALUN
INLO
C2
C3
DECL
PWDN
COMM
ANALYSIS
The slope and intercept are derived using the coefficients of
a linear regression performed on data collected in its central
operating range. Error is stated in two forms: error from the
linear response to the CW waveform and output delta from
25°C performance.
The error from linear response to the CW waveform is the
decibel difference in output from the ideal output defined by
the conversion gain and output reference. This is a measure of
the linearity of the device response to both CW and modulated
waveforms. The error in dB is calculated by
Error
(
dB
)
=
VOUT
−
Slope
×
(
P
IN
−
P
Z
)
Slope
Figure 42. Response Measurement Setup for Power-Down Step
AD811
732Ω
50Ω
HP8112A
PULSE
GENERATOR
(1)
AD8362
COMM
C1
CHPF
DECL
INHI
3dB
BALUN
INLO
C2
C3
SMT03
SIGNAL
GENERATOR
RF 50Ω
DECL
PWDN
COMM
VOUT
VSET
ACOM
C4
ACOM
VREF
VTGT
VPOS
0.01µF
TEK TDS5104
SCOPE
where
P
Z
is the x intercept, expressed in dBm.
Error from the linear response to the CW waveform is not a
measure of absolute accuracy because it is calculated using
the slope and intercept of each device. However, it verifies the
linearity and the effect of modulation on the device response.
Error from the 25°C performance uses the performance of a
given device and waveform type as the reference; it is predomi-
nantly a measurement of output variation with temperature.
TEK P5050
VOLTAGE
PROBE
100pF
Figure 43. Response Measurement Setup for Gated Supply
Rev. D | Page 15 of 32
02923-043
CLPF
02923-042
AD [ ANALOG DEVICES ]
